In Exercises 5–36, express all probabilities as fractions. Social Security Numbers A Social Security number consists of nine digits in a particular order, and repetition of digits is allowed. After...

In Exercises 5–36, express all probabilities as fractions.

Social Security Numbers A Social Security number consists of nine digits in a particular order, and repetition of digits is allowed. After seeing the last four digits printed on a receipt, if you randomly select the other digits, what is the probability of getting the correct Social Security number of the person who was given the receipt?